Initial. Don't... just don't ask.

threeDKit/quickmath.h

@@ -0,0 +1,155 @@
+/*
+
+    3DKIT   version   1.3
+    High speed 3D graphics and rendering library for Linux.
+
+    Copyright (C) 1996, 1997  Paul Sheer   psheer@icon.co.za
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+    MA 02111-1307, USA
+
+*/
+
+#ifndef QUICK_MATH_H
+#define QUICK_MATH_H
+
+#if 0
+#ifndef SVGALIB
+#include "../config.h"
+#endif
+#endif
+
+#ifndef PI
+#define PI 3.14159265358979323846
+#endif
+
+typedef struct {
+    double x, y, z;
+} Vec;
+
+
+#define sqr(x) ((x)*(x))
+
+#define fswap(a, b) \
+{ \
+    double __t_var = (a); \
+    (a) = (b); \
+    (b) = __t_var; \
+}
+
+
+#define swap(a, b) \
+{ \
+    int __t_var = (a); \
+    (a) = (b); \
+    (b) = __t_var; \
+}
+
+#define max(x,y)     (((x) > (y)) ? (x) : (y))
+#define min(x,y)     (((x) < (y)) ? (x) : (y))
+
+#ifndef __GNUC__
+
+double fsqr (double x);
+int lsqr (int x);
+double fmax (double a, double b);
+double fmin (double a, double b);
+double fsgn (double a);
+double dot (Vec a, Vec b);
+Vec cross (Vec a, Vec b);
+Vec plus (Vec a, Vec b);
+Vec minus (Vec a, Vec b);
+Vec times (Vec a, double f);
+double norm (Vec a);
+
+#else
+
+extern inline double fsqr (double x)
+{
+    return x * x;
+}
+
+extern inline int lsqr (int x)
+{
+    return (int) x *x;
+}
+
+extern inline double fmax (double a, double b)
+{
+    return max (a, b);
+}
+
+extern inline double fmin (double a, double b)
+{
+    return min (a, b);
+}
+
+extern inline double fsgn (double a)
+{
+    return (a == 0.0 ? 0.0 : (a > 0.0 ? 1.0 : -1.0));
+}
+
+extern inline double dot (Vec a, Vec b)
+{
+    return a.x * b.x + a.y * b.y + a.z * b.z;
+}
+
+extern inline Vec cross (Vec a, Vec b)
+{
+    Vec c;
+    c.x = a.y * b.z - a.z * b.y;
+    c.y = a.z * b.x - a.x * b.z;
+    c.z = a.x * b.y - a.y * b.x;
+    return c;
+}
+
+extern inline Vec plus (Vec a, Vec b)
+{
+    Vec c;
+    c.x = a.x + b.x;
+    c.y = a.y + b.y;
+    c.z = a.z + b.z;
+    return c;
+}
+
+extern inline Vec minus (Vec a, Vec b)
+{
+    Vec c;
+    c.x = a.x - b.x;
+    c.y = a.y - b.y;
+    c.z = a.z - b.z;
+    return c;
+}
+
+extern inline Vec times (Vec a, double f)
+{
+    Vec c;
+    c.x = a.x * f;
+    c.y = a.y * f;
+    c.z = a.z * f;
+    return c;
+}
+
+extern inline double norm (Vec a)
+{
+    return sqrt (sqr (a.x) + sqr (a.y) + sqr (a.z));
+}
+
+#endif
+
+void orth_vectors (Vec X, Vec * r1, Vec * r2, double r);
+
+#endif
+